The atom probably has 8 neutrons in the nucleus.
Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus.
N(p⁺) = Z = 7; number of protons in the atom
A = N(p⁺) + N(n°)
N(n°) = A - N(p⁺)
N(n°) = 15 - 7
N(n°) = 8; number of neutrons in the atom
N(e-) = N(p⁺) = 7; number of electrons in the atom
Neutron (symbol: n°) is a subatomic particle with no net electric charge.
Protons and neutrons are found in nucleus of an atom (atomic nuclei).
More about neutron: brainly.com/question/15120322
#SPJ4
How many moles of Ba(NO3)2 are there in 0.25 L of a 2.00 M Ba(NO3)2 solution?
Use Molarity equals StartFraction moles of solute over liters of solution EndFraction..
0.13 mol
0.50 mol
2.25 mol
8.0 mol
Answer:
0.5moles
Explanation:
Given parameters:
Volume of solution= 0.25L
Molarity of solution = 2.00M
Unknown:
Number of moles = ?
Solution:
To solve this problem;
Molarity is the number of moles of solute in a given volume of solution, so
Number of moles = molarity x volume
Now insert the parameters and solve;
Number of moles = 0.25 x 2 = 0.5moles
Answer:
b
Explanation:
got it right on test
How many molecules are in 0.0740 mol NH3?
Number of molecules NH₃ = 4.45 x 10²²
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol of NH₃ = n = 0.074
So the number of molecules :
[tex]\tt N=n\times No\\\\N=0.0740\times 6.02\times 10^{23}\\\\N=4.45\times 10^{22}[/tex]
Joe compared an ice cube to the liquid water from the ice cube after it melted. Which of the following statements is an observation from the student's comparison?
O Both have a definite mass and volume, and both have a definite shape.
O Both have a definite mass and volume, but neither has a definite shape.
O Both have a definite mass and volume, but only the liquid water has a definite shape.
O Both have a definite mass and volume, but only the frozen ice cube has a definite shape.
Answer:
Both have a definite mass and volume, but only the frozen Ice cube has definite shape
Explanation:
Water(Liquid) Takes on the forms of other things, Such as cups
The equation below represents the combination of gaseous atoms of non-metal X and of hydrogen to form gaseous X2He6 molecules. 2X(g) + 6H(g) → X2H6(g) AH = -2775 kJ mol The bond energy of an X-H bond is 395 kJ mol. What is the bond energy of an X-X bond? A - 405.0kJmol-¹ B -202.5kJmol-¹ C +202.5kJ mol-¹ D +405.0kJ mol-¹
Answer:
D +405.0kJ mol-¹
Explanation:
Since bond energy is the energy required to break a bond, the energy of dissociation of X₂H₆ = +2775 kJmol⁻¹.
Since there is one X-X bond and six X-H bonds,
Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆.
Since bond energy of one X-H bond = 395 kJ mol⁻¹, then
Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆
Bond energy of one X-X bond + 6 × one X-H bond = +2775 kJmol⁻¹.
Bond energy of one X-X bond + 6 × 395 kJ mol⁻¹ = +2775 kJmol⁻¹.
Bond energy of one X-X bond + 2370 kJ mol⁻¹ = 2775 kJmol⁻¹
Bond energy of one X-X bond = 2775 kJmol⁻¹ - 2370 kJ mol⁻¹
Bond energy of one X-X bond = +405 kJmol⁻¹
Multi-Step Conversions (Always go through moles!)
Example: How many grams of water (H2O) will you need in order to have
3.22 x 1024 water molecules?
Mass of water needed : 96.3 g
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
moles H₂O=
[tex]\tt moles=\dfrac{N}{No}\\\\moles=\dfrac{3.22\times 10^{24}}{6.02\times 10^{23}}\\\\moles=5.35[/tex]
mass H₂O(MW=18 g/mol) :
[tex]\tt mass=moles\times MW\\\\mass=5.35\times 18\\\\mass=96.3~g[/tex]
The pressure of a mixture within a rigid container of nitrogen, carbon dioxide and oxygen is 150 kPa. What
is the partial pressure of oxygen if the partial pressures of nitrogen and carbon dioxide are 100 kPa and 24
kPa, respectively?
Answer:
P(O₂) = 26KPa
Explanation:
Given data:
Total pressure = 150 KPa
Partial pressure of nitrogen = 100 KPa
Partial pressure of carbon dioxide = 24 KPa
Partial pressure of oxygen = ?
Solution:
According to Dalton law of partial pressure,
The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.
Mathematical expression:
P(total) = P₁ + P₂ + P₃+ ............+Pₙ
Now we will solve this problem by using this law.
P (total) = P(O₂) + P(N₂) + P(CO₂)
150 KPa = P(O₂) + 100 KPa + 24 KPa
150 KPa = P(O₂) + 124 KPa
P(O₂) = 150 KPa - 124 KPa
P(O₂) = 26KPa
Help someone!!!I will mark you brainliest
Answer:
a) Na2S
b) AlF3
c) O2
d) C6H12O6
Explanation:
please mark me brainliest and 5 star
which
state
one
mose
in poverty?
Answer:
New Hampshire is the most in proverty.
Explanation:
I learned this before.
Answer:
Oklahoma state
Explanation:
please mark me as brainliest
Can one mole of peas fit inside your house? List the materials and steps of an experiment that answers the
question without actually filling up your house with peas!
Answer:
No.
Explanation:
No, one mole of peas do not fit inside a house because one mole is equals to 6.022 × 10²³ units which is a very large value. mole only use for atoms, ions and molecules etc due to very small size but mole is not used for big sized materials such as peas and other vegetables etc. So that's why we can conclude that one mole of peas did not fit inside a house.
a lever was used to lift a heavy rock the input force was 150 n and the output force was 500 n what was the mechanical advantage of the pulley
Answer:
Option A. 3.3
Explanation:
The following data were obtained from the question:
Input force = 150 N
Output force = 500 N
Mechanical advantage (MA) =.?
Mechanical advantage can be defined as force output divided by force input i.e
Mechanical advantage (MA) = force output / force input
With the above formula, we can obtain the mechanical advantage of the pulley as shown below:
Input force = 150 N
Output force = 500 N
Mechanical advantage (MA) =.?
MA = force output / force input
MA= 500/150
MA = 3.3
Thus, the mechanical advantage of the system is 3.3
how did rutherford interpret the fact that most of the ????α particles seemed to pass right through the foil?
Ernest Rutherford gave the atomic model based on the centrally located mass of the atom. The α particles passed through the foil as an atom has empty spaces.
What is Rutherford's atomic theory?Rutherford gave the atomic model by bombarding the gold foil with an alpha particle from radioactive material. It gave the atomic structure constituting the sub-atomic particles.
Most of the alpha particles passed straight through the foil which concluded that most of the space in the atom was empty and the major mass was accumulated at the center.
Therefore, the α particles passed straight as most of the atom has empty spaces.
Learn more about Rutherford's atomic theory, here:
https://brainly.com/question/28427666
#SPJ4
What is magnetic fields?
how dose pendulum work
Answer:
Pendulum, body suspended from a fixed point so that it can swing back and forth under the influence of gravity. Pendulums are used to regulate the movement of clocks because the interval of time for each complete oscillation, called the period, is constant.
Explanation:
It is a simple tool which helps in balancing, healing and clearing our mind and body. They help us seek answers to certain questions by picking on subtle vibrations. They do so by moving in the direction of invisible energy around us.
what element is [Ar] 452 3010 5p5
Answer:
Argon
Explanation:
Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas
hope it helps!
What letter represents the trough? :) PLEASE FAST!
1) A
2) B
3) C
4) D
True or false. When an area within an atom is crowded with electrons it is known as a dipole "moment False True
Answer:true
Explanation:
Answer:
im not sure but ill say false
Explanation:
who will help it science
Answer:
yuh because it's the hot water :)
4.imidazole has two nitrogen atoms, labeled as n3 and n1. please indicate which nitrogen is more basic. draw the products of protonating both nitrogen atoms and use this as part of your explanation.
[tex]N_3[/tex] is more basic than [tex]N_1[/tex] in imidazole.
Imidazole have two nitrogen attached in the ring at [tex]N_1 and N_3[/tex] .
This compound is an aromatic compound as it have [tex](4n+2)[/tex]π electrons which means lone pair electrons of [tex]N_1[/tex] nitrogen atom also takes part in π
system.
Thus when a proton attacks on this compound it easily attacks at [tex]N_3[/tex] rather than [tex]N_1[/tex].
After the attack of [tex]H^{+}[/tex] ion at [tex]N_3[/tex] the conjugate base thus formed is also aromatic and hence is more stable.
If the proton had attacked at [tex]N_1[/tex] the conjugate base would not be aromatic and its stability will decrease.
The reaction is shown in the image attached
To know more about protonation
https://brainly.com/question/14094032
#SPJ4
Which statement or question is a good hypothesis?
A. Taxicabs are yellow.
B. Red cars are cooler than green cars.
C. Black cars heat up faster in sunlight than white cars.
D. What color of car sells best?
Answer:
c is the awnser
a hypothesis is not a question it is more like a statment and something that could be proven in the future
A pH of 1 there are a lot of ______ in a solution. 2.A pH of 14 there are a lot of ______ in a solution.
Answer:
Hydrogen or hydroxonium ions in the solution
Hydroxyl ions in the solution
Explanation:
A pH of 1 shows there is a lot of hydroxonium ions in the solution and a pH of 14 shows there is a lot of hydroxyl ions in the solution.
The pH scale ranges from 1 to 14 As the values tends towards 1, the acidity increases due to concentration of hydroxonium ions in the solution. As the pH tends towards 14, the basicity increases due to the concentration of hydrogen ions in the solution.Which force saves the atom by emitting particles from the nucleus?
Answer:
nuclear force
I hope this helps :)
Explanation:
What happens to ions during bonding to form an ionic compound? O Cations accept electrons and anions give away electrons. O Anions and cations share electrons. O Cations give away electrons and anions accept those electrons.
Answer:
Last one: Cations give away electrons and anions accept those electrons.
Explanation:
Just did it
Answer:
D
Explanation:
"Cations give away electrons and anions accept those electrons."
Which element forms an ion that is larger than its atom
Answer:
Electronegative element form anion that is larger than its neutral atom like fluorine F-
Explanation:
Write the names of the following covalent compounds: no2
Answer:
nitrogen dioxide
Explanation:
this was on my chemistry test
A chemical reactions is shown. How many different elements and total atoms are involved in the reaction?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, to determine the number of different element participating in a reaction, count the number of individual atoms participating the reaction. For example,
H₂SO₄ + 2NaOH ⇒ Na₂SO₄ + 2H₂O
The number of different elements involved in the reaction above are hydrogen (H), sulphur (S), oxygen (O) and sodium (Na). This means there are 4 different elements involved in the reaction.
But to determine the total number of atoms involved in a reaction, one must first ensured the reaction is balanced (because the number of each atom must be considered). Using the same reaction illustrated earlier hydrogen (H) has 2 atoms in H₂SO₄ and 2 atoms in NaOH, sulphur (S) has 1 atom in H₂SO₄, oxygen (O) has 4 atoms in H₂SO₄ and 2 atoms in NaOH and sodium (Na) has 2 atoms in NaOH. Thus, total number of atoms is 13 atoms.
Note that the number of atoms on the reactant side would be same as number of atoms on product side because of law of conservation of matter. Thus, participating atoms in the reaction is 13
You can tell if an unknown substance is an base because:
Answer:
if it is hydroxide
Explanation:
when metal. and non-metal most the time reacts and the none metal is hydroxide u can easily say it Is base
Which of the following is NOT a characteristic of metals that can be attributed
to the bonding and arrangement of atoms?
brittleness
ductility
malleability
electrical conductivity
the answer is Brittleness
The characteristic that is not present in metals that can be attributed to the bonding and arrangement of atoms is brittleness. The correct option is A.
What are metals?Metals are the chemical elements present in the periodic table. They are classified as metals because of their properties of reacting, softness and malleability, etc.
Some metals are iron, oxygen, magnesium, aluminum, etc. They are both solid, liquid, or gas. They are highly electrical or thermally conductive, ductile, and reflective.
On the other hand, non-metals are less reactive, very hard, and non-malleable. Brittleness is the quality of non-metals, not metals. Due to the brittleness of non-metals, they are not easy to the bonding and arrangement of atoms.
Thus, the correct option is A. brittleness.
To learn more about metals, refer to the link:
https://brainly.com/question/1854312
#SPJ6
The formula of gypsum and that of plaster of parls are CaSO4.xH2O and CaSO4.yH2O respectively.
The difference x-y equals to;
1) 1
2) 3/2
3) 5/2
4) 1/2
Help me
Answer:
[tex]\frac{3}{2}[/tex]
Explanation:
Given formula of Gypsum:
CaSO₄. xH₂O,
True formula:
CaSO₄. 2H₂O, x = 2
Formula of plaster of paris = CaSO₄. [tex]\frac{1}{2}[/tex] H₂O,
y = [tex]\frac{1}{2}[/tex]
The difference between x and y; x - y:
x - y = 2 - [tex]\frac{1}{2}[/tex] = [tex]\frac{3}{2}[/tex]
A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this 2-heptanone compound is CH3C4H8COCH3. How many atoms of each element are in one molecule of 2-heptanone?
Question 2 options:
4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom
7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom
7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms
6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms
Answer:
B
Explanation:
Sorry if wrong
Answer:It’s D, when you add up the atoms for carbon you get 6, and the only answer choice with 6 is D
What volume (liters) of aqueous 0.325 M nitric acid is required to react completely with 3.68 g barium hydroxide?
Volume (liters) of aqueous 0.325 M nitric acid is 0.132 L
Further explanationReaction
2HNO₃ + Ba(OH)₂ → Ba(NO₃)₂ + 2H₂O
mass of Ba(OH)₂ = 3.68 g
mol Ba(OH)₂(MW=171,34 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{3.68}{171,34 g/mol}\\\\mol=0.0215[/tex]
From the equation, mol ratio of HNO₃ : Ba(OH)₂ = 2 : 1, so mol HNO₃:
[tex]\tt mol~HNO_3=\dfrac{2}{1}\times 0.0215=0.043[/tex]
Molarity of HNO₃ = 0.325, then the volume of HNO₃ :
[tex]\tt V=\dfrac{n(mol)}{M(molarity)}\\\\V=\dfrac{0.043}{0.325}\\\\V=0.132~L[/tex]